This post is an info dump on all professional teams, from all sports, that have been based in the Maritimes. For the purpose of this post the Quebec Major Junior Hockey League (QMJHL) is being counted as a professional league.

Leagues That Have Had Franchises in Atlantic Canada:
ABA = American Basketball Association
AHL = American Hockey League
CBCL = Cape Breton Colliery League
CSL = Canadian Soccer League
EPHL = Eastern Professional Hockey League
IPHL = Interprovincial Professional Hockey League
MPHL = Maritime Professional Hockey League
NBL = National Basketball League (summer)
NwBL = New Brunswick League
NBLC = National Basketball League of Canada
NBML = New Brunswick Maine League
PBL = Premier Basketball League
QMJHL = Quebec Major Junior Hockey League
WBL = World Basketball League (summer)

Bathurst, New Brunswick

Acadie-Bathurst Titan, QMJHL (1998-present)

Total Seasons = 17 (17 hockey)

Charlottetown, Prince Edward Island

Prince Edward Island Senators, AHL (1993-96)

Prince Edward Island Rocket, QMHL (2003-13)

Charlottetown Islanders, QMJHL (2013-present)

Island Storm, NBLC (2013-present)

Total Seasons = 17 (15 hockey & 2 basketball)

Fredericton, New Brunswick

Fredericton Express, AHL (1981-88)

Fredericton Canadiens, AHL (1990-99)

Fredericton, NwBL (1888-90)

Fredericton Pets, NBML (1913)

Total Seasons = 20 (16 hockey & 4 baseball)

Halifax, Nova Scotia

Halifax Cresents, IPHL (1910-11) MPHL (1911-14)

Halifax Socials, MPHL (1911-14)

Nova Scotia Voyageurs, AHL (1971-1984)

Nova Scotia Oilers, AHL (1984-88)

Halifax Citadels, AHL (1988-93)

Halifax Mooseheads, QMJHL (1994-present)

Halifax Windjammers, WBL (1991-92) NBL (1993-94)

Halifax Rainmen, ABA (2007-08) PBL (2008-11) NBLC (2011-present)

Nova Scotia Clippers, CSL (1991)

Total Seasons = 61 (48 hockey, 12 basketball & 1 soccer)

Moncton, New Brunswick

Moncton Victorias, IPHL (1910-11) MPHL (1911-13)

New Brunswick Hawks, AHL (1978-82)

Moncton Alplines, AHL (1982-84)

Moncton Golden Flames, AHL (1983-87)

Moncton Hawks, AHL (1987-94)

Moncton Alpines, QMJHL (1995-96)

Moncton Wildcats, QMJHL (1996-present)

Moncton Miracles, NBLC (2011-present)

Moncton, NwBL (1888-90)

Total Seasons = 48 (39 hockey, 4 basketball, 3 baseball)

New Glasgow, Nova Scotia

New Glasgow Cubs, IPHL (1910-11) MPHL (1911-13)

New Glasgow Black Foxes, MPHL (1913-14) EPHL (1914-15)

Total Seasons = 5 (5 hockey)

Saint John, New Brunswick

Saint John Flames, AHL (1993-2003)

Saint John Sea Dogs, QMJHL (2005-present)

Saint John Millrats, PBL (2010-11) NBLC (2011-present)

Saint John Nationals/Saint Johns, NwBL (1888-90)

Saint John Shamrocks, NwBL (1888-90)

Saint John Marathons, NBML (1913)

Total Seasons = 32 (20 hockey, 5 basketball, 7 baseball)

Summerside, Prince Edward Island

Summerside Storm, NBLC (2011-13)

Total Seasons = 2 (2 basketball)

St. John’s, Newfoundland & Labrador

St. John’s Maple Leafs, AHL (1991-2005)

St. John’s Fog Devils, QMJHL (2005-08)

St. John’s IceCaps, AHL (2011-present)

Total Seasons = 21 (21 hockey)

Sydney, Nova Scotia

Sydney Millionaires, MPHL (1912-14) EPHL (1914-15)

Glace Bay Miners, EPHL (1914-15)

Cape Breton Oilers, AHL (1988-96)

Cape Breton Screaming Eagles (1997-present)

Cape Breton Breakers, NBL (1993-94)

Dominion Hawks, CBCL (1937-38)

Glace Bay Miners, CBCL (1937-39)

New Waterford Dodgers, CBCL (1937-39)

Sydney Steel Citians, CBCL (1937-39)

Sydney Mines Ramblers, CBCL (1937-39)

Total Seasons = 46 (30 hockey, 2 basketball & 14 baseball)

Grand Totals = 267 seasons (211 hockey, 27 basketball, 28 baseball & 1 soccer) or as a percentage (79% hockey, 10.1% basketball, 10.5% baseball & 0.4% soccer). Assuming that the National Basketball League of Canada doesn’t fold this summer, the total number of professional basketball seasons (by team) will pass baseball next season.

Ignoring the overlap, there have been 49 seasons of professional hockey played in Atlantic Canada (1910-15, 1971-present). Compared to 12 seasons of professional basketball (1991-94 (summer season) then 2007-present (winter season), 7 professional baseball (1889-90, 1913, 1937-39) and 1 season of professional soccer (1991).

There have been some teams who have been awarded to the region but folded (or the league folded) before the team(s) got to play one game. The zero game club includes:

Atlantic Schooners, Canadian Football League (1984) – no stadium, was to be based in Halifax/Dartmouth

Halifax IceBreakers, World Hockey Association (2004) – league never played a game

Saint John Mariners, Federal Hockey League (2003) – league never played a game

Halifax Havoc, North American Indoor Football League (2005) – league never played a game

Fredericton Feud, North American Indoor Football League (2005) – see above

St. John’s Storm, North American Indoor Football League (2005) – see above

It’s possible there could be more to the above list, but these six are the only ones I am aware of.